How does Yarrow work?

Are there safety concerns?

Yarrow seems to be safe for most adults. In some people, yarrow might cause drowsiness and increase urination when taken by mouth. When it comes in contact with the skin, yarrow might cause skin irritation.

Do not take yarrow if:

You are pregnant or breast-feeding.

You have an allergy to ragweed, chrysanthemums, marigolds, daisies, and many others.

You are scheduled for surgery in the next two weeks. Yarrow might increase the risk of bleeding.